Unable to access Posted information in Custom Controller

Content

Hey All,

I'm playing around with the Javascript Fetch API but I am unable to send data. I preform the post with a simple bit of data to send and echo the data on the controller side. When i exec the fetch function it shows that the $_POST array is empty.

Am I doing something wrong? Does RNT do something special that is tripping me up here?

Thanks,
Simon

Version

3.7

Code Snippet

             JS
function genProductList4(){
	fetch("/cc/AjaxReportCaller/productSelector", {
		method: 'POST',
		data:{language: 'ru'},
		credentials: 'same-origin'
  	})
	.then((res) => res.text())
	.then((data) => console.log(data));
}


PHP

function productSelector(){
   echo "Where are the posts? \n";
   var_dump( $_POST );
}

RESPONSE
genProductList4()
undefined
Where are the posts? 
array(0) {
}